/
drain.go
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/
drain.go
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/*
* Tencent is pleased to support the open source community by making TKEStack
* available.
*
* Copyright (C) 2012-2019 Tencent. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use
* this file except in compliance with the License. You may obtain a copy of the
* License at
*
* https://opensource.org/licenses/Apache-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package storage
import (
"context"
"net/http"
"strings"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
"k8s.io/apiserver/pkg/registry/generic/registry"
"k8s.io/apiserver/pkg/registry/rest"
"k8s.io/client-go/kubernetes"
platforminternalclient "tkestack.io/tke/api/client/clientset/internalversion/typed/platform/internalversion"
"tkestack.io/tke/api/platform"
"tkestack.io/tke/pkg/platform/apiserver/cluster"
"tkestack.io/tke/pkg/platform/util"
)
// DrainREST implements list versions of cluster
type DrainREST struct {
rest.Storage
store *registry.Store
platformClient platforminternalclient.PlatformInterface
}
// ConnectMethods returns the list of HTTP methods that can be proxied
func (r *DrainREST) ConnectMethods() []string {
return []string{"POST"}
}
// NewConnectOptions returns versioned resource that represents proxy parameters
func (r *DrainREST) NewConnectOptions() (runtime.Object, bool, string) {
return &platform.HelmProxyOptions{}, true, "path"
}
// Connect returns a handler for the helm-api proxy
func (r *DrainREST) Connect(ctx context.Context, clusterName string, opts runtime.Object, responder rest.Responder) (http.Handler, error) {
clusterObject, err := r.store.Get(ctx, clusterName, &metav1.GetOptions{})
if err != nil {
return nil, err
}
c := clusterObject.(*platform.Cluster)
if err := util.FilterCluster(ctx, c); err != nil {
return nil, err
}
proxyOpts := opts.(*platform.HelmProxyOptions)
clientset, err := util.ClientSetByCluster(ctx, c, r.platformClient)
if err != nil {
return nil, err
}
return &drainHandler{
requestPath: proxyOpts.Path,
clientset: clientset,
}, nil
}
// New creates a new helm proxy options object
func (r *DrainREST) New() runtime.Object {
return &platform.HelmProxyOptions{}
}
type drainHandler struct {
requestPath string
clientset kubernetes.Interface
}
func (h *drainHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
nodeName := strings.Trim(h.requestPath, "/")
node, err := h.clientset.CoreV1().Nodes().Get(req.Context(), nodeName, metav1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
responsewriters.WriteRawJSON(http.StatusNotFound, errors.NewNotFound(corev1.Resource("Node"), nodeName), w)
return
}
responsewriters.WriteRawJSON(http.StatusInternalServerError, errors.NewInternalError(err), w)
return
}
err = cluster.DrainNode(req.Context(), h.clientset, node)
if err != nil {
responsewriters.WriteRawJSON(http.StatusInternalServerError, errors.NewInternalError(err), w)
return
}
responsewriters.WriteRawJSON(http.StatusCreated, node, w)
}